I made a Doom-like game fit inside a QR code
I sometimes pick up random projects just because I can, this was one of those times. I made it as a week long project a while back this year but never shared here, so thought to go for it haha. I created a game inspired by Doom and the backrooms called The Backdooms under 2.4kb in minified html. (for reference, this entire post would be around 1.8kB haha) I had to use a not popular way of using GZip with Zlib headers (had to write my own script for compressing it, also in the repo) to eventually convert it a size 40 QR code that works right in your browser using Decompressionstream API. This…
In plain words
The Backdooms is a Doom-inspired game compressed into a 2.4KB HTML file that runs directly from a QR code in the browser. Built as a week-long project, it combines raycasting technology similar to the original Doom with procedurally generated maps. The creator developed custom compression scripts using GZip with Zlib headers to fit the playable game into a size-40 QR code, utilizing the browser's Decompressionstream API to decompress and run it. The tool is for developers interested in extreme code compression and retro-style game design.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I sometimes pick up random projects just because I can, this was one of those times. I made it as a week long project a while back this year but never shared here, so thought to go for it haha. I created a game inspired by Doom and the backrooms called The Backdooms under 2.4kb in minified html. (for reference, this entire post would be around 1.8kB haha) I had to use a not popular way of using GZip with Zlib headers (had to write my own script for compressing it, also in the repo) to eventually convert it a size 40 QR code that works right in your browser using Decompressionstream API. This is of course a very oversimplified description of it, using a lot of the same technologies that DOOM had but combining it with infinite seed based map generation in 2.4kb (QR codes can only store 3kb, which includes changing formats) was pretty hard. Here are some links about it if you want to nerd out and read more: Repository Link (MIT License): https://github.com/Kuberwastaken/backdooms A Hosted (slightly improved) version of The Backdooms: https://kuberwastaken.github.io/backdooms/ Game Trailer: https://www.youtube.com/shorts/QWPr10cAuGc My Linkedin post about it: https://www.linkedin.com/feed/update/urn:li:activity:7295667... (PS: You'd need something like https://qrscanner.org/ or something that can scan bigger QR codes and put the text data onto your browser to play it) My Blogs documenting the process and development in detail: https://kuberwastaken.github.io/blog/Projects/How-I-Managed-... https://kuberwastaken.github.io/blog/Projects/How-I-Managed-...
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